Cutting mechanism.



' Patented .Ian. 7, I902.

' No. 690,52L-

' I F, HERB. I .CUTTlN-G MECHANISM.

V (Appligation filed June 1, 1901.) (No Model.)

UNITED STATES PATENT OFFICE.

. FREDRIOK HERB, OF NEW YORK, N. Y., ASSIGNOR TO ROBERT HOE, OF

NEW YORK, N. Y.

CUTTING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 690,521, dated January 7, 1902.

Application filed June 1, 1901. Serial No. 62,753. (No model.)

To all whom it may concern.-

Be it known that I, FREDRICK HERB, a citizen of United States, residing at New York, county of Kings,and State of New York, have invented certain new and useful Improvements in Cutting Mechanisms, fully described and represented in the following specification and the accompanying drawings, forming a part of the same. I

This invention relates to certain improvements in cutting mechanism, and more particularly to the cutting mechanism employed for severing sheets from webs of paper.

In the fast rotary printing-machines now ordinarily employed the printed webs are divided into sheets by means of serrated cutting-blades mounted in cuttingcylinders. These blades either perforate the web, the sheets being thereafter separated from the web by accelerating that portion of the web which is to form the sheet, thus detaching the sheet from the web on the line of perforations, or they operate to entirely sever the sheet from the web. In using serrated blades, however, difficulty has been experienced in keeping the edges of the sides of the serrations or teeth sharp clear down to the bottom of the depression or crotch between the teeth, and as these edges of the blade become dull the cut produced is not clean, so that the edge of the paper presents a ragged appearance.

It is the object of this invention to produce a cutting-blade for use in printing-machines and in other analogous relations which shall be free from the objection above stated.

In the accompanying drawings, which form a part of this specification, and in which like characters of reference indicate the same parts, Figure 1 is a front view of the cuttingcylinders of a printing-machine. Fig. 2 is a side elevation of the improved cutting-blade, certain parts being broken away. Fig. 3 is a central vertical section on the line 3 3 of Fig. 2.

Referring to the drawings, 1 and 2 indicate the cutting-cylinders of an ordinary printingmachine, the web of paper W being shown as passing to said cylinders from the ordinary drawing-rolls 3. The cylinder 1 is provided with a cutting member 4, said member being mounted between the knife-blocks 5 in the usual manner. The cylinder 2 carries the ordinary cooperating cutting member 6, said member being usually a block of Wood pro- 1 vided witha groove 7, with which the cuttingmember 4 cooperates. The cylinder 2 is also provided with the usual sheet-taking pins, (indicated at 8,) said pins being mounted and operated in the ordinary manner.

The cutting member 4 in accordance with the present invention consists of a plurality of serrated cutting-blades, (marked 9 and 10, respectively,) two being shown, though more might, under some circumstances, be used. These blades are so arranged that the serrated cutting projections 11 of each blade are ner shown can be easily sharpened, since it is not necessary in sharpening to file the edges of the teeth or serrations clear down to the point of the crotch or depression between two adjacent teeth, as is the case where a single blade is used. With a composite blade of the character described it is only necessary in sharpening it to insure that the upper parts of the side edges of each tooth of each blade are sharp, as when the blades are assembled only the upper parts of the edges of the teeth are operative. When the blades are filed in the ordinary manner, therefore, and are assembled, that portion of the cutting edges of each tooth which comes into operation is sharp, and consequently the space between the tooth of one blade and the adjacent tooth of the other blade is bounded by sharp edges.

What is claimed is 1. A cutting-blade comprising a plurality of serrated members, the cutting projections of each member being arranged opposite the spaces of the cutting projections of the memher next to it, substantially as described.

2. A cutting-blade comprising two serrated members, the cutting projections of one member being arranged opposite the spaces between the cutting projections of the other member, substantially as described.

3. A cutting-blade comprising two serrated members, the cutting projections of one member being arranged opposite the spaces between the cutting projections of the other member and substantially centrally between the same, substantially as described.

4. A cutting-blade comprising two serrated members, the cutting projections of one member being arranged opposite the spaces between the cutting projections of the other my hand in the presence of two subscribing.

witnesses.

FREDRIOK HERB.

Witnesses:

F. W. H. CRANE, GEO. M. BROWN. 

